I have three hens that look like around their eyes is slightly swollen and a little red. I checked them to see if they had drainage coming from their eyes. There is no drainage, no foul smells, no sneezing, or wheezing in any of this hens. I do however have one hen that keeps one eye closed as if it is scratched or something. It has been extremely cold and very windy so we have left the coop doors closed. (Negative temps) My husband decided to bed them with straw and I am wondering if that may be causing part of this issue. Can anyone advise me on what I should do? I have oxytetracycline here, but have never used it. We have 40 chickens and 9 ducks in the coop. Any advise would be greatly appreciated.